Submerged and fusible device with safety valves that replace the faulty thermostat unit in an engine or analogue

A safety device for controlling circulation of a cooling fluid in a cooling system of an internal combustion engine, said safety device being located in a pipe connecting the engine and a radiator and comprising:

• a valve seat including an opening therein and a retention member extending therefrom;
• a poppet which is movable toward and away from said valve seat and hence into and out of said opening to increase and decrease resistance to flow of the cooling fluid through said opening;
• a temperature sensing means which is immersed in the cooling fluid for controlling the movement of said poppet such that as a temperature of the cooling fluid increases said poppet is moved away from said valve seat and as the temperature of the cooling fluid decreases said poppet is moved toward said valve seat, said temperature sensing means including a movable element having an enlarged portion;
• a solder element which directly connects said enlarged portion of said poppet to said movable element of said temperature sensing means to prevent relative movement therebetween, said solder element being formed of an eutectic material which melts directly from a solid state to a liquid state at a predetermined safety temperature such that said poppet moves with said movable element so long as the safety temperature is not exceeded;
• a first spring which is compressed between said enlarged portion of said movable element and said retention member of said valve seat and thereby urges said movable element and hence said poppet connected thereto by said solder element toward a position for engagement of said poppet with said valve seat;
• and
• a second spring which engages said poppet and urges said poppet away from said valve seat in a direction opposite to the urging of said first spring such that if the cooling fluid reaches the safety temperature and said solder element melts there no longer is an attachment between said poppet and said movable element and said second spring moves said poppet away from said valve seat and decreases resistance to flow of the cooling fluid through said opening.